Full-Stack Software Engineer
Reinforcement Learning
Location
San Francisco, California, United States
Work type
Hybrid
Employment
Full Time
Experience
5-8 years
Compensation
$300K - $405K per year
Posted
3d ago
Summary and responsibilities
Role overview
Summary
As a Full-Stack Software Engineer in Reinforcement Learning, you will develop platforms, tools, and interfaces crucial for environment creation, data collection, and training observability for Claude's next generation AI. This role involves owning product surfaces end-to-end, from backend services and APIs to web UIs, and rapidly shipping polished, reliable products in a fast-paced, ambiguous environment.
About the Role
As a Full-Stack Software Engineer in RL, you'll build the platforms, tools, and interfaces that power environment creation, data collection, and training observability. The quality of Claude's next generation depends on the quality of the data we train it on — and the systems you build are what make that data possible.
You'll own product surfaces end-to-end — from backend services and APIs to the web UIs that researchers, external vendors, and thousands of data labelers use every day. You don't need a background in ML research. What matters is that you can take an ambiguous, high-stakes problem and ship a polished, reliable product against it, fast.
This team moves very quickly. Claude writes a lot of the code we commit, which means the bottleneck isn't typing — it's judgment, taste, and the ability to react to what researchers need next. You'll iterate on data collection strategies to distill the knowledge of thousands of human experts around the world into our models, and you'll do it in a loop that closes in hours and days, not quarters or months.
Anthropic's Reinforcement Learning organization leads the research and development that trains Claude to be capable, reliable, and safe. We've contributed to every Claude model, with significant impact on the autonomy and coding capabilities of our most advanced models. Our work spans teaching models to use computers effectively, advancing code generation through RL, pioneering fundamental RL research for large language models, and building the scalable training methodologies behind our frontier production models.
The RL org is organized around four goals: solving the science of long-horizon tasks and continual learning, scaling RL data and environments to be comprehensive and diverse, automating software engineering end-to-end, and training the frontier production model. Our engineering teams build the environments, evaluation systems, data pipelines, and tooling that make all of this possible — from realistic agentic training environments and scalable code data generation to human data collection platforms and production training operations.
What You'll Do
Build and extend web platforms for RL environment creation, management, and quality review — including environment configuration, versioning, and validation workflows
Develop vendor-facing interfaces and tooling that let external partners create, submit, and iterate on training environments with minimal friction
Design and implement platforms for human data collection at scale, including labeling workflows, quality assurance systems, and feedback mechanisms that surface reward signal integrity issues early
Build evaluation dashboards and observability UIs that give researchers real-time insight into environment quality, training run health, and reward hacking
Create backend services and APIs that connect environment authoring tools, data collection systems, and RL training infrastructure
Build and expand scalable code data generation pipelines, producing diverse programming tasks with robust reward signals across languages and difficulty levels
Develop onboarding automation and documentation tooling so new vendors and internal users ramp up in hours, not weeks
Partner closely with RL researchers, data operations, and vendor management to translate ambiguous requirements into well-scoped, well-designed products
You May Be a Good Fit If You
Have strong software engineering fundamentals and real full-stack range — you're comfortable owning a surface from database schema to frontend
Are proficient in Python and a modern web stack (React, TypeScript, or similar)
Have a track record of shipping systems that solved a hard problem, not just shipped on time — e.g. you built the thing that made your team 10x faster, or the internal tool nobody thought was possible
Operate with high agency: you identify what needs to be done and drive it forward without waiting for a ticket
Have found yourself wondering
Updated 2d ago
Candidate fit
Skills and qualifications
Additional skills
Experience
5-8 years
How this role is positioned
Role classification
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Employment
Full Time
Contract duration
Permanent
Hiring type
Direct
Global hiring
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Offer details
Compensation and benefits
Compensation
$300K - $405K per year
Benefits and perks
Location, schedule, and role shape
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Company snapshot
Company
Anthropic
Team size
Growing team
Location
San Francisco, California, United States
Anthropic’s mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.
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Full-Stack Software Engineer
San Francisco, California, United States • Full Time